Modern C++ design by Andrei Alexandrescu

[Saint]

I am reading this book and have this code:

#include <cassert>

template <class To, class From>
To safe_reinterpret_cast ( From from)
{
   std::assert ( sizeof (From)  <=  sizeof (To) );
   return reinterpret_cast <To> (from);
}

int main()
{
   char c = 'a';
   char* pc = safe_reinterpret_cast <char*> (c);
}

I get the following error but I don't understand why:

=> g++ p4.cxx
p4.cxx: In function `To safe_reinterpret_cast(From)':
p4.cxx:6: syntax error before `static_cast'

[WingedPanther]

What are classes To and From?

[Saint]

In a class the book provided. Is this where the error is?

[WingedPanther]

The problem is: I can't diagnose the problem without knowing how those two classes are related to each other.